U-Pb and Ar-40-Ar-39 geochronology of the ophiolites and granitoids from the Tauride belt: Implications for the evolution of the Inner Tauride suture

作者：Parlak Osman^*; Karaoglan Fatih; Rizaoglu Tamer; Klotzli Urs; Koller Friedrich; Billor Zeki

来源：Journal of Geodynamics, 2013, 65: 22-37.

DOI：10.1016/j.jog.2012.06.012

• Inner Tauride suture
• Ophiolite
• Granitoid
• U-Pb dating
• Ar-40-Ar-39 dating

The Inner Tauride ocean separated the Tauride-Anatolide Block from the Central Anatolian Crystalline Complex. This oceanic basin was consumed as a result of north-dipping subduction and closed during the latest Cretaceous to early Cenozoic times. Subduction-related magmatism and metamorphism occurred at different stages during the closure of the Inner Tauride ocean. The ophiolites and granitoids record the tectonic events. In this paper, we present new U-Pb zircon age determinations by LA-MC-ICP-MS and Ar-40-Ar-39 age dating of selected ophiolites (Mersin, Pozanti-Karsant, Pinarbasi and Divrigi) and granitoids (Horozkoy and Divrigi) along the Inner Tauride suture zone. The results show that: (i) the crystallization age of SSZ oceanic crust is similar to 89 Ma and the magmatic activity continued until just prior to ophiolite emplacement onto the Tauride-Anatolide platform during the latest Cretaceous (Maastrichtian), (ii) the timing of intraoceanic thrusting/subduction is constrained as similar to 89 Ma, which is consistent with steady-state subduction in a forearc tectonic setting, (iii) the timing of collision of the Tauride-Anatolide passive margin with the subduction trench of the Inner Tauride ocean and subsequent slab break-off occurred from 76 to 67 Ma, and (iv) the timing of continent-continent collision between the Central Anatolian Crystalline Complex and the Tauride-Anatolide Block is constrained as Eocene (50-49 Ma). The first three tectonic stages overlap each other during the closure of the Inner Tauride oceanic basin. %26apos;Soft%26apos; collision of the subduction trench with the passive margin was followed by hard-collision and suture tightening similar to 8-10 My later.

• 出版日期2013-4